Abstract: A cutting device for a thin metallic plate is provided which shortens time for shaping or the like on a cut edge to improve manufacturing efficiency, and increases the life of a cutter. The cutting device for cutting a thin metallic plate W with a predetermined width includes a shearing cutter 7 which is made of a metal having a higher hardness than the thin plate W and has a blade angle of 50 to 90°. A contacting member 5 is provided which includes a groove 8 facing the shearing cutter 7 and makes contact with the back side of the thin plate W. In the groove 8, an interval a between upper edges 9a and 9b of inner walls 9 is set at 15 to 30 times a thickness b of the thin plate W. A depth c of a deepest portion 11 in the groove 8 is set at one to three times the thickness b of the thin plate W. The inner walls 9 of the groove 8 include curved surfaces 10, each of which has a curvature radius of 15 to 50 times the thickness b of the thin plate.

Abstract: There are disclosed a method and device for polishing a metal ring, which is capable of polishing a side edge of the metal ring without performing barrel polishing or polishing by grinding stones. Subsequently to a projecting step of projecting a metal ring W by clearing means 6, a first brush polishing step of polishing one edge of the metal ring W by a polishing brush 60 is performed. Subsequently, an inverting step of inverting the metal ring W whose one edge is polished by the first brush polishing step is inverted by the inverting means 10 is performed. Subsequently, a second brush polishing step of polishing the other edge of the metal ring W which is inverted by the inverting step by the polishing brush 60 is performed. Moreover, a clearing step of clearing the metal ring whose other edge is polished by the second brush polishing step by clearing means 7 is performed.

Abstract: There are disclosed a method and device for polishing a metal ring, which is capable of polishing a side edge of the metal ring without performing barrel polishing or polishing by grinding stones. Subsequently to a projecting step of projecting a metal ring W by clearing means 6, a first brush polishing step of polishing one edge of the metal ring W by a polishing brush 60 is performed. Subsequently, an inverting step of inverting the metal ring W whose one edge is polished by the first brush polishing step is inverted by the inverting means 10 is performed. Subsequently, a second brush polishing step of polishing the other edge of the metal ring W which is inverted by the inverting step by the polishing brush 60 is performed. Moreover, a clearing step of clearing the metal ring whose other edge is polished by the second brush polishing step by clearing means 7 is performed.

Abstract: A cutting device for a thin metallic plate is provided which shortens time for shaping or the like on a cut edge to improve manufacturing efficiency, and increases the life of a cutter. The cutting device for cutting a thin metallic plate W with a predetermined width includes a shearing cutter 7 which is made of a metal having a higher hardness than the thin plate W and has a blade angle of 50 to 90°. A contacting member 5 is provided which includes a groove 8 facing the shearing cutter 7 and makes contact with the back side of the thin plate W. In the groove 8, an interval a between upper edges 9a and 9b of inner walls 9 is set at 15 to 30 times a thickness b of the thin plate W. A depth c of a deepest portion 11 in the groove 8 is set at one to three times the thickness b of the thin plate W. The inner walls 9 of the groove 8 include curved surfaces 10, each of which has a curvature radius of 15 to 50 times the thickness b of the thin plate.